Lunula (amulet)

lunulae) was a crescent moon shaped pendant worn by girls in ancient Rome.

[1] Girls ideally wore them as an apotropaic amulet,[2] the equivalent of the boy's bulla.

Lunulae were common throughout the entire Mediterranean region while their male counterpart, the bulla, was most popular in Italy.

An explicit definition is provided by Isidore of Seville: "Lunulae are female ornaments in the likeness of the moon, little hanging gold bullae."

But in Plautus' play Rudens, Palaestra says her father gave her a golden bulla on the day of her birth.